Druzy is the glittering effect of tiny crystals over top a colorful mineral. The druzy quartz gems grow slowly over millions of years and are found as the very last layer of growth on agate or another colorful base. It does not always refer to quartz, druzy is any kind of mineral found in a plate-like form, such as garnets, calcite, dolomite and malachite. Common colors are white, yellow, brown, red, and orange. While they look sparkly and delicate, druzy quartz is a fairly durable gem.